A 100 m long hillslope has a uniform slope angle of 40° and is underlain by a 2 m thick soil, as illustrated below. The soil has the following physical properties: a friction angle of 30°, cohesion of 15 kPa, density of 2,000 kg/m³, and a hydraulic conductivity of 1000 cm/day. Assume that a long-lasting, steady rainstorm occurs so that all precipitation infiltrates the surface and travels through the soil layer as shallow subsurface storm flow. What precipitation rate would be required to trigger a landslide at the toe of the hillslope?
A 100 m long hillslope has a uniform slope angle of 40° and is underlain by a 2 m thick soil, as illustrated below. The soil has the following physical properties: a friction angle of 30°, cohesion of 15 kPa, density of 2,000 kg/m³, and a hydraulic conductivity of 1000 cm/day. Assume that a long-lasting, steady rainstorm occurs so that all precipitation infiltrates the surface and travels through the soil layer as shallow subsurface storm flow. What precipitation rate would be required to trigger a landslide at the toe of the hillslope?
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
Problem 1LR
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Question
![A 100 m long hillslope has a uniform slope angle of 40° and is underlain by a 2 m
thick soil, as illustrated below. The soil has the following physical properties: a
friction angle of 30°, cohesion of 15 kPa, density of 2,000 kg/m³, and a hydraulic
conductivity of 1000 cm/day. Assume that a long-lasting, steady rainstorm occurs
so that all precipitation infiltrates the surface and travels through the soil layer as
shallow subsurface storm flow. What precipitation rate would be required to
trigger a landslide at the toe of the hillslope?
Precipitation
↓↓
↓ ↓
soil
rock
↓ ↓ ↓
100 m
2 m
40°](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F00286e1f-3dfa-463d-8755-33d1f443cb43%2Fc7235e2c-db58-4cb9-a801-d3912460fd2e%2Fp8uv1eo_processed.jpeg&w=3840&q=75)
Transcribed Image Text:A 100 m long hillslope has a uniform slope angle of 40° and is underlain by a 2 m
thick soil, as illustrated below. The soil has the following physical properties: a
friction angle of 30°, cohesion of 15 kPa, density of 2,000 kg/m³, and a hydraulic
conductivity of 1000 cm/day. Assume that a long-lasting, steady rainstorm occurs
so that all precipitation infiltrates the surface and travels through the soil layer as
shallow subsurface storm flow. What precipitation rate would be required to
trigger a landslide at the toe of the hillslope?
Precipitation
↓↓
↓ ↓
soil
rock
↓ ↓ ↓
100 m
2 m
40°
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